NC for this. Regular user, but this is quite personal and sensitive.
I wish my mum (and the other women in my family) had not constantly favoured boys.
My brother (7 years younger than me) could never do a thing wrong, he never got shouted at or scolded, and he got everything he wanted, and I always got blamed for things he did.
I never even had a gift off my parents for my 18th, but he got a school trip to Italy when he was 12 (only 6 months or so after my 18th,) which cost some £400, in the late 1980's, (so like a grand now.)
He had expensive hobbies that milked the family pot dry, and I didn't have a thing for my 21st either. My dad bought me 40 cigarettes and a bottle of wine, about a week after.
I have 4 female cousins and 3 male cousins, and in the eyes of their mothers (my aunts,) their brothers could never/can never do any wrong either. All 4 of my female cousins are just as irked about it as me. Don't know why, but the boys were ALWAYS favoured by the women in my family. (And I am not from a culture that usually favours boys.)
Even my nan favoured my mum's brother over my mother, so I would have thought she'd have known how shitty it felt. Yet she favoured my brother over me, from the second he was born.
I got on with my brother OK as I know it's wasn't his fault, but I rarely see him now. He lives 80-90 miles away and I see him maybe 2 to 3 times a year. He has 2 kids (teens now,) who I barely know tbh. We send Christmas cards to each other and I send a voucher or money each to the kids, and he sent money for mine (when she was school age,) but me and my brother are not close.
Mother died (and dad did) over a decade ago now. I did love them mum (and dad) and I think they loved me, but mum loved my brother more.
I wanted more than anything than to have a daughter so I could try and forge a wonderful mother/daughter relationship that I never had. My prayers were answered when I had DD in the mid 1990's, and we have always been very close, like soulmates. I made sure she knew, from the second she was born, that she was loved more than anything, and there's nothing I wouldn't do for her.
Now she is in her mid 20's she lives 3 miles from me with her boyfriend who I love very much too. She is a well-educated, intelligent, successful young woman, who is brimming with confidence, and knows she is loved very deeply. I have with her what I wish I had had with my mother.
This is a sad thread. So many posters who had cold and detached parents. 
My dad was pretty OK, but he was at work or at the pub 80% of the time. When he was at home, we had fun playing cards and board games, and going for walks. But mum was too busy fawning over my brother, complaining about how shit her life is, and criticising me (for nothing,) for me to have any 'fun' with her!